/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and limitations under the License.
 *
 * =========================================================================================================
 *
 * This software consists of voluntary contributions made by many individuals on behalf of the
 * Apache Software Foundation. For more information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * +-------------------------------------------------------------------------------------------------------+
 * | License: http://www.apache.org/licenses/LICENSE-2.0.txt 										       |
 * | Author: Yong.Teng <webmaster@buession.com> 													       |
 * | Copyright @ 2013-2019 Buession.com Inc.														       |
 * +-------------------------------------------------------------------------------------------------------+
 */
package com.buession.velocity.tools;

import com.buession.core.validator.Validate;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.velocity.tools.config.DefaultKey;
import org.apache.velocity.tools.generic.SafeConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.text.SimpleDateFormat;
import java.util.TimeZone;

/**
 * @author Yong.Teng
 */
@DefaultKey("json")
public class JsonTool extends SafeConfig {

    private final static Logger logger = LoggerFactory.getLogger(JsonTool.class);

    public String encode(Object object){
        return encode(object, null, null, null);
    }

    public String encode(Object object, Boolean ignoreNullValue){
        return encode(object, ignoreNullValue, null);
    }

    public String encode(Object object, String dateFormat){
        return encode(object, null, dateFormat);
    }

    public String encode(Object object, String dateFormat, TimeZone timeZone){
        return encode(object, null, dateFormat, timeZone);
    }

    public String encode(Object object, Boolean ignoreNullValue, String dateFormat){
        return encode(object, ignoreNullValue, dateFormat, null);
    }

    public String encode(Object object, Boolean ignoreNullValue, String dateFormat, TimeZone timeZone){
        ObjectMapper objectMapper = new ObjectMapper();

        if(Boolean.TRUE.equals(ignoreNullValue)){
            objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        }

        if(Validate.hasText(dateFormat)){
            SimpleDateFormat smt = new SimpleDateFormat(dateFormat);
            objectMapper.setDateFormat(smt);

            if(timeZone != null){
                objectMapper.setTimeZone(timeZone);
            }
        }

        try{
            return objectMapper.writeValueAsString(object);
        }catch(JsonProcessingException e){
            logger.warn("{} convert to string error.", object == null ? "<null>" : object, e);
        }

        return null;
    }

}
